Key Highlights

● Western Digital reported fiscal-2026 Revenue of about $12.92 billion, up roughly 35.7% year over year, and traded near $447 on September 11, 2026, for a market Capitalization around $161 billion.

● Applied Optoelectronics posted 2025 revenue of about $455.7 million, up roughly 83% year over year, though it still recorded a net loss of about $38.2 million, with shares swinging across a wide 52-week range of roughly $18.50 to $233.67.

● Energous generated about $5.63 million in 2025 revenue against a net loss around $9.6 million, with a market capitalization of roughly $60 million on only about 5.5 million shares outstanding.

● Momentus and Sidus Space are commercial-space companies, not chipmakers, with 2025 revenue of about $1.11 million and $3.38 million respectively; Sidus raised roughly $158.5 million in capital during 2026 to fund its satellite platform.

Five very different Nasdaq names, a resurgent storage giant, a wireless-power micro-cap, an AI-optics supplier and two small space companies, show how loosely a single sector label can stretch in the middle of an AI-driven hardware cycle.

A Sector Label That Hides Five Very Different Stories

Screen the Nasdaq Composite for semiconductors and electronic technology in September 2026 and you can end up with a strange basket. Western Digital and Applied Optoelectronics sit squarely inside the AI-hardware story. Energous is a tiny wireless-power specialist. Momentus and Sidus Space are small commercial-space companies that most classification systems file under aerospace and industrials, not chips.

That mismatch is the point. What follows verifies each ticker, separates the genuine electronic-technology plays from the outliers, and looks at what is driving, and threatening, each one. The tone here is deliberately cautious: several of these names are micro-caps whose share prices have moved violently over the past year.

The Backdrop: An AI Hardware Cycle Meets Speculative Small-Caps

The connective tissue across a mixed basket like Western Digital (NASDAQ: WDC), Energous (NASDAQ: WATT), Applied Optoelectronics (NASDAQ: AAOI), Momentus (NASDAQ: MNTS) and Sidus Space (NASDAQ: SIDU) is the 2025–2026 build-out of AI computing infrastructure. Data-center operators have been spending heavily on the physical layer beneath large models: storage capacity, optical interconnects and networking gear. That Demand has been a clear tailwind for the two largest names here, Western Digital and Applied Optoelectronics.

At the same time, easing expectations around US interest rates through 2026 have tended to lift speculative, unprofitable small-caps, the kind of stocks where a single contract announcement or a thematic wave can double a share price in weeks. Energous, Momentus and Sidus Space live in that world. Their fundamentals are early-stage; their share prices have swung on sentiment as much as on results.

The result is a theme that is really two themes wearing one label: durable AI-hardware demand at the top, and high-volatility micro-cap speculation below it. Keeping those apart matters more than the sector tag suggests.

Western Digital (NASDAQ:WDC): A Storage Pure-Play Reborn

Western Digital is the anchor of this group, and its structure changed materially before the current cycle. The company completed the spin-off of its flash-memory business, now the separately listed SanDisk (NASDAQ: SNDK), on 24 February 2025. What remains is a focused hard-disk-drive and data-storage business, no longer bundled with NAND flash.

That reshaping has coincided with an unusually strong stretch. According to aggregated market data, Western Digital reported fiscal-2026 revenue of about $12.92 billion, up roughly 35.7% year over year, with Earnings released on 5 August 2026. Management framed the demand backdrop bluntly, describing secular cloud and AI storage growth driving exabyte demand at above a 25% compound annual rate. The stock closed near $447 on 11 September 2026, for a Market Capitalisation around $161 billion.

The SanDisk separation is complete and the company is now a storage-focused business. High-capacity nearline HDDs remain the workhorse for cheap, dense cloud storage, which is exactly what AI data lakes consume. Caution belongs in the forecast: storage has always been cyclical, the reported swing to very high profitability may reflect one-time items as well as pricing, and Sell-Side consensus, 26 Buy ratings and an average target near $665, assumes the cycle holds. What to watch: pricing discipline, hyperscaler capital-spending commentary, and any sign the exabyte tailwind is fading.

Applied Optoelectronics (NASDAQ:AAOI): Leveraged to the Optical Layer

Applied Optoelectronics is the most direct AI-networking play in the group. It designs and manufactures fiber-optic components, optical modules, lasers and transceivers, for internet data centres, cable television and telecom customers. As AI clusters scale, the optical interconnects that move data between servers and racks become a bottleneck, and that is the company's addressable market.

The growth has been real. Aggregated market data shows 2025 revenue of about $455.7 million, up roughly 83% year over year, though the company still posted a net loss of about $38.2 million for the year. The shares closed near $105 on 11 September 2026 for a market capitalisation around $8.95 billion, with an unusually wide 52-week range of roughly $18.50 to $233.67 and a high Beta near 3.78.

Revenue is growing fast on data-centre demand, and the valuation and the enormous trading range tell you the market is pricing this name as a high-torque bet on AI optics rather than a stable earner, since it is not yet consistently profitable. Customer concentration, competition from larger transceiver suppliers, and the ever-present danger that AI-infrastructure orders are lumpy are the key risks. The 52-week swing is the clearest warning that sentiment, not just fundamentals, drives this stock. What to watch: gross-margin trajectory, design wins with major hyperscalers, and whether losses narrow toward breakeven.

Energous (NASDAQ:WATT): A Wireless-Power Micro-Cap Betting on IoT

Energous is a very different animal, a genuine electronic-technology company, but a micro-cap one. It develops RF-based, over-the-air wireless-power networks aimed at Internet-of-Things applications, including battery-free asset tracking for retail, quick-service restaurants and manufacturing.

The numbers are small and volatile. Per aggregated market data, Energous generated about $5.63 million in 2025 revenue, a large percentage jump off a tiny base, while still losing money, with a 2025 net loss around $9.6 million. Trailing-twelve-month revenue was reported near $10.5 million. The shares traded around $10.85 in early September 2026, for a market capitalisation of roughly $60 million on only about 5.5 million shares outstanding, and a 52-week range spanning roughly $3.62 to $36.98.

Energous has commercial deployments and rising revenue, and management has referenced large enterprise customers. But with a market cap near $60 million, a tiny share count and 27 employees, this is a speculative story stock where Liquidity is thin and price swings are extreme. Wireless power at a distance has faced years of adoption and regulatory friction, and the company must scale revenue faster than it burns cash. What to watch: cash runway, whether pilot deployments convert into recurring revenue, and share-count dilution, which is a real risk for names this small.

Momentus (NASDAQ:MNTS): A Space Outlier, Not a Chip Stock

Here the sector label breaks. Momentus is a commercial-space company, most data providers classify it under industrials and aerospace and defence, not semiconductors. It offers satellite buses, solar arrays, components and in-orbit services such as hosted payloads for government and commercial customers.

Its fundamentals are early-stage and shrinking on the top line. Aggregated market data shows 2025 revenue of only about $1.11 million, down nearly 47% year over year, with a net loss around $35.7 million. The stock closed near $4.04 on 11 September 2026 for a market capitalisation around $89 million on roughly 22 million shares, inside a wide 52-week range of about $3.11 to $34.45. Momentus has also raised capital through the period, including a private Placement priced at the market under Nasdaq rules.

This is a listed space company with modest revenue and meaningful losses. Recent price strength has been linked in market commentary to broader space enthusiasm and spillover from private-launch interest rather than company-specific earnings. Continued dilution to fund operations, execution risk on in-orbit services, and the reality that this is a sentiment-driven micro-cap are the swing factors. Investors should treat this name as an outlier in the basket, a space bet, not an electronic-technology one.

Sidus Space (NASDAQ:SIDU): The Second Space Outlier

Sidus Space rounds out the group and is the second name that does not really belong under a semiconductor heading. It designs, manufactures, launches and collects data from commercial satellites, with products including its LizzieSat modular satellite platform, the Fortis VPX computing module and an AI-focused Orlaith ecosystem for space and defence applications.

The financials are small. Per aggregated market data, 2025 revenue was about $3.38 million, down roughly 28% year over year, with a net loss near $29.5 million. The company reported second-quarter 2026 earnings on 14 August 2026 and strengthened its Balance Sheet with capital raises totalling roughly $158.5 million during 2026. The shares traded around $2.00 on 11 September 2026 for a market capitalisation near $202 million.

The company has an operating satellite platform and has raised substantial capital relative to its size, but revenue is still tiny and declining, so the story rests on future satellite launches, data services and defence interest rather than current results. Heavy cash needs, launch and execution risk, and dilution from those large raises are the central concerns. Like Momentus, this stock is best understood as a speculative space micro-cap that a broad sector screen has swept into a semiconductor theme.

What Investors Should Watch

For the two genuine AI-hardware names, the signals are fundamental: hyperscaler capital-spending guidance, storage pricing and exabyte demand for Western Digital, and gross margins, design wins and the path to profitability for Applied Optoelectronics. Both are cyclical, and both have run hard.

For the three micro-caps, the signals are more about survival and sentiment: cash runway and dilution at Energous, and capital raises, launch milestones and space-sector momentum at Momentus and Sidus Space. In names this small, a single financing or contract can move the price far more than any macro trend.

One Screen, Two Very Different Risk Profiles

Grouped by a screen, these five stocks look like one theme. Read closely, they split into two: a durable AI-storage-and-optics story in Western Digital and Applied Optoelectronics, and a cluster of high-risk micro-caps, Energous in wireless power, Momentus and Sidus Space in commercial space, that a loose sector label has bundled in. The AI-hardware cycle is real and is genuinely lifting the larger names, while the outliers ride sentiment more than earnings. Treating the two groups as equivalent simply because a filter placed them side by side would be the mistake this list invites, and the 52-week price swings above make the distinction hard to miss.